KR20100125603A - Recording medium, data recording/reproducing method, and data recording/reproducing apparatus - Google Patents

Abstract

PURPOSE: A recording medium, data recording/reproducing method, and a data recording/reproducing device are provided to improve the stability of the recording medium by preventing physical access toward a non-compatibility recoding medium. CONSTITUTION: A recording medium comprises a data area in which user data is recorded and an inner area locating in the periphery side of the data area. The inner area comprises one or more access control areas in which the access control information, the compatibility information between a recording medium(10) and device, is recorded. The access control information about the multilayer recording medium having more than three record layers is recorded on the access control area. An AV decoder(30) receives a playing signal of a recording medium from a signal processing unit(40).

Description

RECORDING MEDIUM, DATA RECORDING / REPRODUCING METHOD, AND DATA RECORDING / REPRODUCING APPARATUS}

The present invention relates to a recording medium, a data recording / reproducing method and a data recording / reproducing apparatus, and more particularly, to a method and apparatus for controlling physical access to a recording medium and to record / reproduce using the method and apparatus. The present invention relates to a recording medium which can be used.

Recent rapid development of technology has led to the emergence of high-capacity recording media. Examples of such recording media include compact discs (CDs) and digital versatile discs (DVDs). In addition to these recording media, there are recording media that have dramatically increased capacity as next generation recording media. Such recording media include Blu-ray Disc, Near Field Recording Medium, and the like. In addition, in order to further increase the capacity of the recording medium, a multi-layer recording medium having a plurality of recording layers has also appeared.

When such a high-capacity, multi-layer recording medium is loaded into an incompatible data recording / reproducing device, any physical access may damage the data of the recording medium or the data recording / reproducing apparatus. Thus, a need arises for restricting physical access to a recording medium by an incompatible data recording / reproducing apparatus.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned conventional problems, and an object thereof is to enable a data recording / reproducing apparatus to more efficiently control physical access to an incompatible recording medium.

Accordingly, the present invention includes a data area in which user data is recorded and an inner area located on an inner circumferential side of the data area, wherein the inner area includes one or more pieces of access control information, which is information for compatibility between a recording medium and a device, is recorded. And an access control area, the access control area providing a recording medium in which access control information for a multilayer recording medium having three or more recording layers is recorded.

The present invention also includes an embodiment including identification information indicating that access control information for the multilayer recording medium is access control information for the multilayer recording medium.

In addition, the present invention, the access control information for the multi-layer recording medium, the non-recognized access control information for controlling physical access (access) to the multi-layer recording medium when the identification information is not recognized Examples are included.

In addition, the present invention includes an embodiment in which the unrecognized access control information includes information on whether to allow reading of data on a part or all of the region of the multilayer recording medium.

In addition, the present invention includes an embodiment in which the unrecognized access control information includes information on whether to allow data writing on a part or all of the area of the multilayer recording medium.

In addition, the present invention includes an embodiment in which the recording medium can be recorded once.

In addition, the present invention includes an embodiment in which the recording medium is rewritable.

In addition, the present invention includes the step of recording the access control information that is information for compatibility between the recording medium and the device in the access control area of the recording medium, the access control information is a multi-layer recording medium having three or more recording layers It provides a data recording method that is access control information for a.

In addition, the present invention comprises the steps of reading the access control information recorded in the access control area included in at least one recording medium, information for compatibility between the recording medium and the device; And reproducing data of the recording medium according to the access control information, wherein the access control information is access control information for a multilayer recording medium having three or more recording layers.

The present invention also provides a pickup for recording data on a recording medium; And a control unit configured to control the pickup to record access control information, which is information for compatibility between the recording medium and the device, in the access control area of the recording medium, wherein the access control information is a multi-layer having three or more recording layers. Provided is a data recording apparatus that is access control information for a recording medium.

The present invention also provides a pickup for reading data of a recording medium; And read in the access control area included in at least one of the recording mediums to read access control information which is information for compatibility between the recording medium and the device, and to reproduce data of the recording medium according to the access control information. And a control unit for controlling pickup, wherein the access control information is a data reproducing apparatus which is access control information for a multilayer recording medium having three or more recording layers.

The present invention is not limited to the above-described embodiment, and as can be seen in the appended claims, modifications can be made by those skilled in the art to which the present invention pertains, and such modifications are within the scope of the present invention. Reveal.

According to the recording medium, the data recording / reproducing method and the data recording / reproducing apparatus according to the present invention, physical access to the recording medium by the incompatible data recording / reproducing apparatus is restricted. Therefore, the user's access to the data of the recording medium is limited, thereby increasing the security of the recording medium, and increasing the stability of the data recording / reproducing apparatus, avoiding excessive physical access to the incompatible recording medium.

DETAILED DESCRIPTION Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art may easily implement the present invention. In the following description, the same components are given the same names and the same reference numerals for the convenience of description.

The terminology used in the present invention was selected as a general term that is widely used at present, but in some cases, the term is arbitrarily selected by the applicant, and in this case, the meaning of the term is described in detail in the description of the present invention. The present invention should be understood as meanings other than terms.

In the present invention, the recording medium means any medium on which data is recorded or can be recorded. For example, a recording medium is meant to encompass all media regardless of a recording method such as a disk or a magnetic tape. Hereinafter, the present invention will be described by using a disc (Disc), particularly a Blu-ray Disc (BD), as a recording medium for convenience of description, but the technical spirit of the present invention is equally applicable to other recording media. It will be self explanatory.

In addition, the present invention will be described based on the recording medium of the write once type (BD-R) or the rewritable type (BD-RE) among the Blu-ray discs (BD), but the technical idea of the present invention is another type. Applicable to the recording medium of the obvious.

In addition, the recording medium of the present invention is composed of certain units. For example, the recording medium may include a unit called a cluster, and the cluster may include a data frame which is a lower unit. For example, one cluster may be composed of 32 data frames. However, the name and number of each unit may vary depending on the type of recording medium.

1 is a schematic structural diagram of a recording medium 10 according to an embodiment of the present invention.

FIG. 1 illustrates a quadruple layer recording medium 10 composed of four layers L0, L1, L2, and L3. However, the present invention is not limited thereto, and the present invention is applicable to all recording media having three or more layers. Since each layer may be configured in the same structure, it will be described in the present specification based on the first layer (L0).

The recording medium 10 according to an embodiment of the present invention includes an inner zone 210, an outer zone 230, and a data zone 220.

The inner region 210 is located on the inner circumferential side of the recording medium 10, and the outer region 230 is located on the outer circumferential side of the recording medium 10. The inner area 210 and the outer area 230 may include a plurality of information areas INFO in which various information for managing the recording medium 10, such as physical access control information of the recording medium 10, is recorded. It includes.

The data area 220 stores data that a user wants to record. The portion surrounded by the inner region 210 and the outer region 230 on the recording medium 10 becomes a region where data is actually recorded. The data area 220 may include an inner spare area (ISA) 221, an outer spare area (OSA) 223, and a user data area 222. The spare areas 221 and 223 may be used as replacement areas for managing defects occurring in the recording medium 10.

The info area INFO is included in the inner area 210 and the outer area 230 of the recording medium 10. As shown in FIG. 1, the info area INFO may be composed of four INFO1, INFO2, INFO3, and INFO4, and the info1 area INFO1 and the info2 area INFO2 may be formed in the inner area 210. The info3 area INFO3 and the info4 area INFO4 may be located in the outer area 230. The number and arrangement of the info area INFO illustrated in FIG. 1 is merely an embodiment, and various embodiments may be possible without departing from the spirit of the present invention.

2 and 3 are schematic structural diagrams of the info areas INFO1 and INFO2 according to an embodiment of the present invention.

The info area INFO may include a drive area, a defect management area (DMA), a control data area, a pre-write area, a physical access control (PAC) area, and a spare area. ), And the like.

In the drive area, information about a data recording / reproducing apparatus that accesses the recording medium 10 is recorded.

Information for controlling a defect occurring in the recording medium 10 is recorded in the defect management area DMA.

Various control information of the recording medium 10 is recorded in the control data area.

In the pre-write area, structure information of the recording medium 10 or user data of 00h is recorded.

In the physical access control (PAC) area, PAC information for controlling whether to record or reproduce a specific area in the recording medium 10 is recorded. Detailed description of the PAC information will be described later.

The reserved area is a blank area in the info area INFO and becomes an area for future use.

In addition, the write once (-R) recording medium and the rewritable (-RE) recording medium may have structures of different info areas INFO1 and INFO2.

FIG. 2 is a schematic structural diagram of the info areas INFO1 and INO2 of a write once (-R) recording medium according to an embodiment of the present invention, and FIG. 3 is a rewritable (-) method according to an embodiment of the present invention. RE) A schematic diagram of the structure of the info areas INFO1 and INFO2 of the recording medium.

The info1 area INFO1 of the write-once recording medium (-R), unlike the info1 area INFO1 of the rewritable recording medium (-RE), further includes a prewrite area.

Meanwhile, the info3 area INFO3 and the info4 area INFO4 in the outer area 230 may be configured to include a defect management area DMA and a control data area.

In relation to the PAC region, the PAC region included in the info1 region INFO1 may be referred to as the first PAC region PAC 1, and the PAC region included in the info2 region INFO2 may be referred to as a second PAC region PAC 2. have.

PAC information for controlling whether to record or reproduce a specific area in the recording medium 10 is first recorded in the first PAC area PAC1, and a copy thereof may be recorded in the second PAC area PAC2. Accordingly, the same PAC information is recorded in the first PAC area PAC1 and the second PAC area PAC2, so that the PAC information can be protected more reliably. That is, it is possible to prepare for the case where a defect occurs in the PAC region.

When the recording medium 10 is loaded into the data recording / reproducing apparatus, the data recording / reproducing apparatus first reads the PAC information recorded on the recording medium 10. The data recording / reproducing apparatus compares the pre-stored PAC information with the PAC information of the recording medium 10, and in the case of unknown PAC information, the data recording / reproducing apparatus is located in a portion of the recording medium 10 according to the PAC information of the recording medium 10. Physical access is limited.

The PAC information is composed of a PAC cluster, and a plurality of PAC clusters may be recorded in the PAC area. Each PAC cluster includes information for controlling physical access to the recording medium 10.

For example, the PAC cluster is composed of 32 data frames, and the 32 data frames are composed of one cluster, which is a recording unit, so that the PAC information of the recording medium 10 is recorded. do. In addition, the data frame is a recording unit of the recording medium 10, and may be configured as 2048 bytes.

In this regard, when the multilayer recording medium 10 having at least three or more recording layers is loaded into an incompatible data recording / reproducing apparatus, that is, only a single layer or a dual layer. When loaded into a compatible data recording / reproducing apparatus, any physical access may damage the multilayer recording medium 10 or the data recording / reproducing apparatus.

Therefore, when the multilayer recording medium 10 is loaded into an incompatible data recording / reproducing apparatus, writing or reading to the multilayer recording medium 10 should be limited. Therefore, PAC information, which is such restriction information, should be recorded in the multilayer recording medium 10. The PAC cluster, which is the PAC information, may be referred to as a MLP cluster.

Hereinafter, an MLP cluster will be described.

4 and 5 are structural schematic diagrams of an MLP cluster according to an embodiment of the present invention.

The MLP cluster has a PAC_ID field, a PAC format field, a PCA Update Count field, an Unkown PAC Rules field, an unknown PAC Entire_Disc_Flag byte field, a recognized PAC It includes a flag (Known PAC Entire_Disc_Flag byte) field, a segment_i field, and a number of segments field.

In the PAC_ID field, information identifying the type of PAC cluster is recorded. The data recording / reproducing apparatus determines whether the PAC information recorded on the recording medium 10 is recognized through the PAC_ID. The MLP cluster may be set to 4D 4C 50h to indicate that it is an MLP cluster.

Version information of the MLP cluster is recorded in the PAC format field. The MLP cluster may be set to 00h.

The update count information of the MLP cluster is recorded in the PCA Update Count field. The MLP cluster is initially set to 00 00 00 00h and incremented by one each time the MLP cluster is updated.

In the UNKown PAC Rules field, information on a rule applied when the data recording / reproducing apparatus does not recognize the MLP cluster recorded on the recording medium 10 is recorded. That is, when the data recording / reproducing apparatus does not recognize the MLP cluster through the PAC_ID of the PAC cluster read from the loaded recording medium 10, the recording medium 10 is determined by Unkown PAC Rules. It is to restrict physical access to all or part of.

An example of an unrecognized access control rule field is described below with reference to FIGS. 6 and 7.

In the unknown PAC flag field (Unknown PAC Entire_Disc_Flag byte), when the data recording / reproducing apparatus does not recognize the MLP cluster recorded on the recording medium 10, control information applied to the entire recording medium 10 is recorded. . For example, it may be recorded whether the data recording / reproducing apparatus can re-initialize the recording medium 10.

In the MLP cluster, 00h is set in the case of a rewritable (-R) recording medium and does not allow reinitialization of the recording medium 10 in the case of a rewritable (-R) recording medium. 01h can be set to allow initialization.

In the recognized PAC flag field (Known PAC Entire_Disc_Flag byte), when the data recording / reproducing apparatus recognizes an MLP cluster recorded on the recording medium 10, control information applied to the entire recording medium 10 is recorded. The MLP cluster may be set together with the unrecognized PAC flag.

In the segment_i field, location information of a target area to which access is to be restricted in the recording medium 10 is recorded. In the number of segments field, information on the number of segments set is recorded. 00h may be set in the MLP cluster.

The write once (-R) recording medium and the rewritable (-RE) recording medium may have a structure of different MLP clusters.

4 is a schematic structural diagram of an MLP cluster of a write once (-R) recording medium according to an embodiment of the present invention, and FIG. 5 is a view of a rewritable (-RE) recording medium according to an embodiment of the present invention. A structural schematic diagram for an MLP cluster.

In addition, the above-described MLP cluster may be set as a mandatory PAC cluster in which the multilayer recording medium 10 is forcibly provided with at least one or more in the PAC area. Accordingly, at least one or more MLP clusters are recorded on the multi-layer recording medium 10, even when loaded into a data recording / reproducing apparatus compatible only with the existing single-layer or dual-layer recording medium 10. ) And the stability of the device.

6 and 7 are structural schematic diagrams of Unkown PAC Rules of an MLP cluster according to an embodiment of the present invention.

When the data recording / reproducing apparatus does not recognize the MLP cluster read from the loaded recording medium 10, the Unkown PAC Rules writes to a specific area of the recording medium 10. Or control information is recorded.

For example, the Unrecognized Access Control Rules (Unkown PAC Rules) is composed of 4 bytes, so that the bits specified by a predefined rule allow writing or reading of a specific area. Flag information indicating. That is, for example, the b0 bit or the b1 bit may be set as control information indicating whether to allow writing or reading of the PAC area, respectively.

The specific area corresponding to each bit may vary according to designing Unkown PAC Rules, and the rules defined in the MLP cluster are shown in FIGS. 6 and 7. This will be described later.

If each bit is 0b in the Unrecognized Access Control Rules, it is set to allow writing or reading to the corresponding area. If the value is 1b, the corresponding area is set to the corresponding area. It can be set to not allow writing or reading of.

In addition, the write once (-R) recording medium and the rewritable recording medium (-RE) may have a structure of different Unkown PAC Rules.

FIG. 6 is a schematic diagram of Unkown PAC Rules of a write once (-R) recording medium according to an embodiment of the present invention.

The unrecognized access control rules of the write-once (-R) recording medium include the reserved area in the info2 area INFO2, the drive area and the info in the info1 area INFO1. Whether to allow writing or reading of the temporary defect management area TDMA, the control data area, the PAC area, and the data area 220 in the area INFO may be set.

In the MLP cluster, a bit corresponding to another area except the drive area in the info1 area INFO1 is set to a value of 1b, so that an incompatible data recording / reproducing apparatus writes or writes to the area. It can be set so that read is not allowed.

However, the setting of whether to allow the writing or reading of the corresponding area may be performed in various ways without departing from the spirit of the present invention.

7 is a structural schematic diagram of Unkown PAC Rules of a rewritable (-RE) recording medium according to an embodiment of the present invention.

Unrecognized access control rules of rewritable (-RE) recording media include reserved areas in Info2 area INFO2, Info1 area INFO1, and drive areas in Info1 area INFO1. Drive Area, Fault Management Area (DMA) in Info Area (INFO), Control Data Area (Control Data Area), PAC Area, and Whether to Allow Write or Read on Data Area 220 Can be.

Similarly, in the MLP cluster, a bit corresponding to an area other than the drive area in the info1 area INFO1 is set to a value of 1b, so that an incompatible data recording / reproducing apparatus writes to the area. Or it may be set such that read is not allowed.

8 is a block diagram of a data recording / reproducing apparatus according to an embodiment of the present invention.

Referring to the overall configuration of the data recording / reproducing apparatus in detail, first, the pickup 70 includes a laser diode inside to record data on the surface of the recording medium 10 or to reflect the data from the recording medium 10. Read signal.

 The servo 90 controls the tracking and focusing operation of the pickup 70 and the operation of the spindle motor 110.

 The R / F unit 80 generates a focus error signal and a tracking error signal, which are signals that detect out-of-focus and track-out of the laser beam by using the signal output from the pickup 70. .

The spindle motor 110 rotates a disc mounted in the data recording / reproducing apparatus.

The motor driver 100 drives the operation of the pickup 70 and the spindle motor 110 under the control of the servo 90.

The signal processor 40 restores the RF signal received from the R / F unit 80 to a desired reproduction signal value, or modulates and outputs a data signal to be recorded in a format recordable on the recording medium 10. .

The bit encoder 50 converts the write signal output from the signal processor 40 into a bit stream, and the pickup driver 60 transmits the bit stream generated by the bit encoder 50 to the recording medium 10. Convert to an optical signal to be stored.

The memory 150 temporarily stores information related to the recording medium 10 such as defect information of the recording medium 10 or performs a buffer function for temporarily storing data to be recorded or reproduced on the recording medium 10. do.

The controller 120 is configured to control the signal processor 40, the servo 90, and the memory 150 to control a drive including the components to perform data recording or reproducing operations.

The PAC controller 130 controls the controller 120 to generate PAC information for controlling physical access to the recording medium 10 and to record the PAC information in the info area INFO of the recording medium 10. do. The PAC controller 130 may configure the PAC information as a PAC cluster, and in particular, may configure the PAC information for the multi-race recorder 10 as a multi-layer PAC cluster. The PAC controller 130 may include a PAC_ID, a PAC format, an unrecognized access control rule (Unkown PAC Rules), an unrecognized PAC flag (Unknown PAC Entire_Disc_Flag byte), a recognized PAC flag (Known PAC Entire_Disc_Flag byte), and the like. Control unit 120 to record the.

In addition, the PAC controller 130 is recorded in an info area INFO included in at least one of the recording medium 10, and reads the PAC information, which is information for controlling physical access to the recording medium 10. The pickup 70 is controlled to reproduce the data of the recording medium 10 in accordance with the PAC information. PAC information consists of a PAC cluster.

When the PAC control unit 130 reads a MLP (Multi Layer PAC) cluster which is PAC information for the multi-layer recording medium 10, the PAC control unit 130 records the recording medium 10 through the PAC_ID of the MLP cluster. It is determined whether the recognized PAC information is recognized. If the PAC control unit 130 does not recognize the MLP cluster, the PAC control unit 130 may access a specific area of the recording medium 10 according to the unrecognized access control rules of the MLP cluster. , Write or read is restricted.

The PAC controller 130 is illustrated as one component, but the present invention is not limited thereto. The functions of the PAC controller 130 may be performed by interworking with several components, and the PAC controller 130 may be implemented in an integrated form with the controller 120 and / or the host 140. In addition, the PAC controller 130 may include a signal processor 40, a bit encoder 50, a pickup driver 60, a pickup 70, a servo 90, a motor driver 100, a spindle motor 110, and a controller ( 120 may be additionally connected to a drive including the memory 150 to enable updating.

The host 140 is in charge of controlling all components of the data recording / reproducing apparatus, and interfaces with a user to control recording or reproducing of the recording medium 10. Specifically, the host 140 transmits a command to the control unit 120 to cause the data recording / reproducing apparatus to perform a specific function, and the control unit 120 is configured to interoperate with each other in the data recording / reproducing apparatus according to the command. You control the elements.

In this regard, the control unit 120 and the host 140 may be provided and operated separately, and the functions of the control unit 120, the PAC control unit 130, and the host 140 are integrated into one control unit. It is also possible to work.

The host 140 may be a main controller of a computer, a server, an audio device, or a video device. That is, the recording / playback apparatus may be an optical drive provided to a personal computer (PC) or the like, or may be a player not mounted on the personal computer.

Accordingly, the data recording / reproducing apparatus according to the present invention can be applied to both an optical drive and a player utilized as a single product mounted and operated inside a PC.

In addition, the AV encoder 20 converts an input signal into a signal of a specific format recordable on the recording medium 10 and transmits it to the signal processor 40 in order to record data on the recording medium 10. For example, the AV encoder 20 may encode the input signal into an MPEG format signal. The signal processor 40 adds an error correction code (ECC) to the signal encoded by the AV encoder 20, converts the signal into a format recordable on the recording medium 10, and transmits the converted signal to the bit encoder 50.

In addition, the AV decoder 30 finally decodes the reproduction signal of the recording medium 10 received from the signal processing unit 40 and provides it to the user as output data such as a video and an audio signal. The AV decoder 30 may be configured of a plurality of decoders according to the type of data.

The components of the data recording / reproducing apparatus according to the present invention described above may be implemented as software or hardware to perform respective functions, or may be implemented by interworking with the software and hardware.

Although the preferred embodiments of the present invention have been described above, the present invention is not limited thereto, and various modifications and changes can be made within the scope of the claims and the detailed description of the invention and the accompanying drawings, and the present invention is also provided. Naturally, it belongs to the range of.

1 is a schematic structural diagram of a recording medium according to an embodiment of the present invention.

2 and 3 are schematic structural diagrams of the info areas INFO1 and INFO2 according to an embodiment of the present invention.

4 and 5 are structural schematic diagrams of an MLP cluster according to an embodiment of the present invention.

6 and 7 are structural schematic diagrams of Unkown PAC Rules of an MLP cluster according to an embodiment of the present invention.

8 is a block diagram of a data recording / reproducing apparatus according to an embodiment of the present invention.

Claims (15)

A data area in which user data is recorded and an inner area located on an inner circumferential side of the data area, The inner region includes one or more access control regions in which access control information, which is information for compatibility between a recording medium and a device, is recorded. In the access control area, access control information about a multilayer recording medium having three or more recording layers is recorded. The access control information for the multilayer recording medium includes identification information. The method of claim 1, Access control information for the multilayer recording medium, And non-recognized access control information for controlling physical access to the multilayer recording medium when the identification information cannot be recognized. The method of claim 2, The unrecognized access control information, Recording medium including information on whether to allow reading of data on a part or all of the multilayer recording medium. Recording access control information which is information for compatibility between the recording medium and the device in an access control area of the recording medium; The access control information is access control information for a multilayer recording medium having three or more recording layers. And access control information for the multilayer recording medium comprises identification information. The method of claim 4, wherein Access control information for the multilayer recording medium, And unrecognized access control information for controlling physical access to the multilayer recording medium when the identification information cannot be recognized. The method of claim 5, The unrecognized access control information, And information on whether to allow data reading for a part or all area of the multilayer recording medium. Reading access control information recorded in an access control area included in at least one recording medium, the access control information being information for compatibility between the recording medium and a device; And Reproducing data of the recording medium according to the access control information; The access control information is access control information for a multilayer recording medium having three or more recording layers. And the access control information for the multilayer recording medium includes identification information. The method of claim 7, wherein Access control information for the multilayer recording medium, And unrecognized access control information for controlling physical access to the multilayer recording medium when the identification information cannot be recognized. The method of claim 8, The unrecognized access control information, And information on whether to allow data reading for a part or all area of the multilayer recording medium. A pickup for recording data on the recording medium; And And a controller configured to control the pickup to record access control information, which is information for compatibility between the recording medium and a device, in the access control area of the recording medium. The access control information is access control information for a multilayer recording medium having three or more recording layers. And access control information for the multilayer recording medium comprises identification information. The method of claim 10, Access control information for the multilayer recording medium, And non-recognized access control information for controlling physical access to the multilayer recording medium when the identification information cannot be recognized. The method of claim 11, The unrecognized access control information, And information on whether to allow data reading for a part or all area of the multilayer recording medium. A pickup for reading data of the recording medium; And Read in the access control area included in the at least one recording medium, the access control information which is information for compatibility between the recording medium and the device, A control unit for controlling the pickup to reproduce data of the recording medium according to the access control information; The access control information is access control information for a multilayer recording medium having three or more recording layers. And access control information for the multilayer recording medium includes identification information. The method of claim 13, Access control information for the multilayer recording medium, And unrecognized access control information for controlling physical access to the multilayer recording medium when the identification information cannot be recognized. The method of claim 14, The unrecognized access control information, And information on whether to allow reading of data to a part or all area of the multilayer recording medium.

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